Rygel
Rygel is a streaming media server compatible with many DLNA/UPnP clients including the Sony PlayStation 3, Microsoft Xbox 360, smart televisions, DLNA speakers and many smartphones. Rygel will automatically transcode media to a format compatible with the client device. It can also utilise published media hierarchies from external applications like Rhythmbox and DVB Daemon through the D-Bus MediaServer specification. It is under active development and is a part of the GNOME project.
Installation
Install the rygel package.
Configuration
After having installed Rygel on a GNOME environment, go to Settings > Sharing > Media Sharing, then turn Media Sharing on. In Folders add or exclude the folders you want to share or not, and in Networks select in which network should the media be shared.
Rygel can be configured globally (/etc/rygel.conf) or per-user (~/.config/rygel.conf). The default /etc/rygel.conf is well documented.
More information on these and other configuration options can be found with rygel.conf(5).
Troubleshooting
When starting Rygel from the command line, there are several options that might help you troubleshoot any strange behaviour. Find out more about these options with rygel(1).